<html>
  <head>
    <title>Hacker News</title>
    <link rel="stylesheet" href="/public/css/index.css">
  </head>
  <body>
      <form action="/register" method="POST">
         <input type="text" name="username" placeholder="请输入用户名"/><br>
         <input type="text" name="mobile" placeholder="请输入手机号" ><br>
         <button type="submit">提交</button>
      </form>
  </body>
</html>